Lintelfilm Posted October 26, 2016 Share Posted October 26, 2016 My Sigma 18-35mm 1.8 AF just completely stopped working (on a C100 MkII). I was in continuous focus mode and I think it *may* have been me adjusting the manual focus ring that caused it to go. But as I understand it the 18-35mm has full time manual override enabled as default. When I attach it to the Sigma Dock the Full Time MF button is greyed out so I can't change it anyway (unlike the 50-100mm which can have it switched on or off with the dock). Anyways, the 18-35mm AF is back to normal now but it was gone for a good half hour or more and I have no idea what I did to fix it. I've tried to break it again by manual focusing in continuous AF mode but so far it's just freaked out a bit as you'd expect it to (man vs machine - continuous DPAF vs MF) but returned to normal as soon as I stop turning the focus ring. The Sigma 1.8 zooms have always made slightly unpleasant noises in continuous AF mode but I'm worried that the 18-35mm sounds worse/"jumpier" since the fault occurred. But it could just be me being paranoid and it always sounded like that. Anyone else had anything similar happen with the 18-35mm (or any other lens for that matter!)? Quote Link to comment Share on other sites More sharing options...
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